Office Coordinator

About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.

Our culture is built on three principles:

• Extreme Ownership – We take full responsibility for outcomes, relentlessly driving toward solutions.

• Engineer Out Requirements, then Automate – We simplify, optimize, and then automate for scale.

• Share Your Legos – We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.

Join us as we build the future of responsible mineral sourcing and supply.

The Role

We are hiring an Office Coordinator to support daily business operations, ensure smooth office functionality, and help drive operational excellence during a highgrowth phase of our project.

In this role, you’ll manage office logistics, assist with HR coordination, provide administrative support across departments, help facilitate safety and compliance activities, and serve as a central point of contact for trucking and recycling deliverables. This is a highly cross-functional position with ample opportunity to expand responsibilities as the project scales and new operational needs emerge.

What You’ll Do

Accounting & Operations Support

• Coordinate, schedule, and verify copper truck logistics.

• Track recycling program deliverables, including buildout tasks and scrapcopper trucking workflows.

• Organize clerical and operational data for internal systems such as Replit.

• Complete and reconcile employee expense reports.

• Oversee employee housing transitions, including scheduling, documentation, and move logistics (and Personnel Camp oversight once constructed).

• Conduct light vehicle fleet inspections and monitor preventive maintenance schedules.

Office Management

• Maintain snack inventory and coordinate lunch orders and pickups.

• Manage guest signins, gate entry, and visitor communication.

• Greet and direct visitors; oversee digital signin systems and daily entry reviews.

• Assist with travel and accommodation arrangements.

Human Resources Support

Recruiting & Hiring

• Schedule preemployment physicals; complete I9 verification and EVerify submissions.

• Conduct newhire orientation.

• Coordinate onboarding tasks including IT, workstation, and desk setup.

Engagement & Events

• Distribute and track uniforms, work shirts, and employee swag.

• Update and maintain workplace TV display announcements.

• Assist with holiday party planning: venue bids, comparisons, invitations, RSVP tracking, and logistics.

• Support swag purchasing, distribution, and gift procurement.

• Assist with tour groups and event venue planning.

Safety

• Maintain and restock firstaid kits.

• Coordinate MSHA training schedules and track employee attendance.

Desired Qualifications

• Strong organizational and time-management skills.

• Excellent verbal and written communication abilities.

• Ability to manage multiple tasks and prioritize effectively.

• Proficiency with computers and office applications (email, spreadsheets, digital forms).

• Professional and welcoming demeanor with visitors, vendors, and employees.

Why Join Us?

At Mariana Minerals, you’ll be part of a mission-driven team reshaping the way critical minerals are sourced and supplied globally. You’ll have the autonomy to make big decisions, the tools to innovate, and a culture that values ownership, smart automation, and collaboration.

Mariana is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected status.